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Evolution and Diversity of Slipper Snails and Their Allies (Gastropoda: Calyptraeidae)Skip to main content. Log in using OpenID. Log in using OpenID. Evolution and Diversity of Slipper Snails and Their Allies (Gastropoda: Calyptraeidae). Welcome to Evolution and Diversity of Slipper Snails. The family Calpytraeidae is made up of three main genera:. Cup and saucer snails),. Hat snails) and several smaller, less common genera. All of the species have limpet-shaped shells with an internal shelly septum. The genera are distinguished by shell morphology. In. The shell is conical with a central...
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